Generate balanced random bits with an unbalanced random bit generator

[Etchira]

What is the expected number of coin flips for getting a head?

[Rabbit]

I have no idea what your question is. Your title and the body of your post do not match.

[Nepomuk]

To answer the question in the body of your question: It depends on what the probability of getting head should be. You can't find a number of flips where it will be 100% but you can get close.